D-20APPENDIX D: TROUBLESHOOTING

Cable Connection Problems

Table D-7Cable Connection Problems

Problem

Possible Causes

Possible Solutions

Link Status LED indicates that

One or both of the ATM ports forming

Ensure that both ports are enabled.

there is a problem with a link.

the connection are turned off (disabled).

 

Far End Status LED indicates

The cable at either end of the link has

Ensure that the cable is securely connected to the

that there is a problem with the

ATM Module’s transmit

become loose or accidentally

port at both ends of the link.

disconnected.

 

connection.

 

 

 

The two connectors at one end of the fiber cable may be plugged into the port the wrong way around.

The fiber optic is caught under a heavy object or become bent out of shape.

The cable connector may be dirty.

Check each end of the cable to ensure that each of the fiber connectors is correctly connected. You may need to reverse the TX and RX cable connectors at one end of the connection.

Remove any obstructions and straighten out any kinks in the cable.

If you suspect that the fiber optic connector is dirty, refer to “Cleaning Dirty Fiber Optic Connectors” in this chapter.

The cable may be broken.

The connector itself is physically damaged.

Replace the cable, and check the LED again.

Contact your repair center for advice. For more details, refer to Appendix E.

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IBM ATM OC-3c manual Cable Connection Problems, Far End Status LED indicates